Rolex celebrates the spirit of discovery and those who dare to tread where no one has before, with the launch of its new Explorer II. Since climbers began wearing Rolex watches in the 20th century - notably Sir Edmund Hillary and Sherpa Tenzing Norgay on their quest to reach the top of Mount Everest in 1953 - the brand has become synonymous with buccaneers. The first Explorer, launched in 1970, and this latest version, turns back the clock and looks to the original for inspiration. The larger, 42mm case houses the Rolex 3187 self-winding movement. New technologies have enabled Rolex to add a non-magnetic parachrom hairspring, improving the reliability of the watch, while Paraflex shock absorbers make it more resistant to knocks. An orange, arrow-shaped 24-hour hand mirrors the one on the original model, but today's technology allows the hand to be set independently and display a second time zone with the 24-hour hand and bezel. The watch also features a GMT 12-hour hand. Other new additions see white or black dials fitted with a Chromalight display, which emits a blue glow capable of lasting up to eight hours, twice as long as that of standard luminescent materials. Giving the hands on the black model a black base creates a 'phantom' effect of floating across the dial, another nod to the original Explorer. Elsewhere, watchmaking technology meets the regatta in the new chronograph Yacht-Master II. The watch is fitted with the 4160 movement, whose 360 components were synchronised only after 35,000 hours in the laboratory. It includes the parachrom hairspring, which is 10 times more resistant to shocks. An interaction between the movement and bezel allows a countdown sequence from one to 10 minutes to be set. Once the countdown is launched, the chronograph can be synchronised to the official regatta countdown. The Rolex Ring Command Bezel rotates 90 degrees with the movement, allowing the countdown programming to be set and locked. Graduations on the white lacquered dial and bezel make it easy to read the red countdown minute and seconds hands. Like all Rolex watches in the Oyster category, the Yacht-Master II has a Triplock winding crown that screws tightly against the case, making it waterproof to 100 metres. The case is made from steel or Rolex's own Everose gold. Daytona is the most famous motor racing circuit in the United States and lends its name to the Rolex Daytona series. These watches are built for speed, and the new Cosmograph Daytona encompasses technology, sporting aesthetics and sophistication. A new monobloc bezel made from ceramic makes it almost impossible to scratch and impervious to corrosion and fading; a layer of pink gold makes it easier to read graduations on the bezel. A tachymetric scale provides an instant reading of short periods of elapsed time, which can be measured to within one-eighth of a second. An Everose gold case and chocolate brown dial finish the watch. Other new releases include the Oyster Perpetual Datejust Special Edition, which becomes the first 34mm watch in Everose gold. The new Lady-Datejust, meanwhile, comes in yellow or white gold and steel and has a dial crafted from gold crystals and set with diamonds.